Device for shearing metal sections

ABSTRACT

A device for shearing metal sections by twisting comprises interacting dies in the form of bushings one of which is capable of turning around its axis while the other one can slide axially in the body and is flexibly pressed against the face of the turnable die in the metal shearing plane. The turnable die is connected with a rotating element by a clutch.

United States Patent [1 1 Boborykin et al.

DEVICE FOR SHEARING METAL SECTIONS Inventors: Jury Alexandrovich' Boborykin,

' Pomerki DMS KhAl, kv. 43; Jury Goergievich Kurkin, ulitsa 23, Avgusta 3l-a, kv. 15, both of Kharkov, U.S.S.R.

Filed: Mar. 10, 1972 Appl. No.: 233,458

US. Cl.....' 225/102, 83/199 Int. Cl B26! 3/00 Field of Search 225/102; 83/199 References Cited UNITED STATES PATENTS 358,884 3/1887 Roberts 225/102 X June 19, 1973 1,366,693 1/1921 Kemble; 225/102 X 3,255,940 6/1966 Ridenour 225/102 Primary Exqminer--Frank T. Yost Attorney-Eric I-l. Waters, John G. Schwartz and .1. Harold Nissen [57] ABSTRACT A device for shearing metal sections by twisting comprises interacting dies in the form of bushings one of which is capable of turning around its axis while the other one can slide axially'in the body and is flexibly pressed against the face of the turnable die in the metal shearing plane. 1

The turnable die is connected with a rotating element by a clutch.

4 Claims, 2 Drawing Figures DEVICE FOR SHEARING METAL SECTIONS The device according to the invention belongs to the equipment for shearing non-circular metal sections into blanks and can be used, say, in mechanical engineering.

Known in the art are devices for shearing noncircular metal sections into blanks, comprising interacting dies with holes corresponding to the profile of the metal sections wherein one die is installed in the body with a provision for turning on a slide moved by a lever and a hydraulic cylinder while the other die is immovable.

The disadvantages of the known devices are their low efficiency because their idle travel does not coincide with the working motion and they need a very powerful drive.

An object of the present invention is to provide a device for shearing non-circular metal sections into blanks of such a design which would ensure a high efficiency of the process.

Another object of the invention is to reduce the re quired power of the drive.

This and other objects are accomplished by providing a device for shearing non-circular metal sections into blanks comprising a body which accommodates interacting dies installed on the same axis and made in the form of bushings with holes corresponding to the profile of the metal sections, one of said bushings being capable of turning around its axis wherein, according to the invention, the device has a rotating drive element and a clutch installed coaxially between said element and the turnable die, while the other die is capable of sliding axially in the body and is flexibly pressed against the face of the turnable die to ensure a constant contact at the metal separation plane.

Such a design will ensure a high efliciency of shearing the metal sections at a low power of the drive.

To ensure reliable engagement of the clutch with the turnable die, their adjoining faces may be provided with interacting cams.

The drive element of the device may have a flywheel secured in the body on one and the same axle with the clutch and dies and rotated by a drive.

For transmitting rotation from the drive element to the clutch, the device according to the invention may incorporate a turning key entering a slot made partly in the clutch and partly in the flywheel.

Such an arrangement of the device will step up its efficiency and reduce the power of the drive.

Now the invention will be described in detail by way of example with reference to the accompanying drawings, in which:

FIG. 1 is a longitudinal section of the device according to the invention;

FIG. 2 is a view along arrow A in FIG. 1.

The device consistsof a body 1 accommodating a case 2 provided with an intermediate support 3 secured on a post 4. Located inside the case 2 are two dies 5, 6 in the form of bushings with holes corresponding to the profile of the metal sections. The die 5 is capable of turning around its axis while the die 6 has a provision for axial movement. a

To prevent the die 6 from turning, the internal surface of the case 2 is provided with splines (not shown in the drawings).

Installed on bearings in the L.I-I. part of the body 1 on a hollow supporting shaft 7 arranged coaxially with the dies 5, 6 is a flywheel 8. A clutch 9 rotating on sliding-contact bearings on the shaft 7 is installed between the flywheel 8 and the turnable die 5.

The flywheel 8 and the clutch 9 are engaged with the aid of a turning key 10 entering a slot made partly in the clutch 9 and partly in the flywheel 8; engagement is effected through a system of rods 11 by pressing a pedal 12.

The flywheel 8 is driven by a V-belt drive through a pulley 13 of an electric motor 14 installed on a special plate 15 (FIG. 2) hinged to the body I.

The V-belts are tensioned by bolts 16 located on a channel bar secured to a removable panel 17.

The drive is controlled by a starter 18 with a pushbutton box 19 installed in the RH. side of the body.

The face surfaces of the clutch 9 and turnable die 5 directed to each other are providedwith engaging cams 20 which prevent overloading of the device.

The dies 5, 6 are pressed against the clutch 9 by a set of springs 22 via a pressure plate 21.

The device is flxed in the initial position by a band brake 23 of a conventional type. A housing 24 closes the device on top.

The device functions as follows:

In the initial position the flywheel 8 and the clutch 9 are disengaged. The blank is fed into the hollow shaft 7 and dies 5, 6 through a specified length.

On starting the electric motor 14 the flywheel 8 is spinned up and accumulates energy.

Then, by pressing the pedal 12, the key 10 is turned through a system of rods 11 and the flywheel 8 comes in engagement with the clutch 9 which is connected by cams 20 with the turnable die 5 and pressed against it by the nonturning die 6 with the aid of springs 22.

The springs 22 are set for a maximum moment through the pressure plate 21. The blank 25 is sheared.

After the flywheel 8 has turned through 300-3l0, the band of the brake 23 begins to be tensioned by an eccentric located on its surface. Simultaneously, the key 10 turns and the flywheel is disengaged from the clutch 9. The system returns to the initial position.

What is claimed is:

1. A device for shearing non-circular metal sections into blanks by twisting comprising: a body; two inter acting dies installed coaxially in said body and made in the form of bushings with holes for the passage of the metal sections, one of the bushings being capable of turning around its axis while the other one can slide axially in said body and is flexibly pressed against the face of said turnable die in the metal shearing plane; a rotating drive element installed in said body coaxially with said dies; a clutch installed coaxially between said rotating' element and turnable die for coupling them.

2. A device according to claim I. wherein the faces of said clutch and turnable die directed to each other are provided with engaging cams.

3. A device according to claim 1 wherein said drive element has a flywheel secured in said body on the same axle with said clutch and dies and rotated by a drive.

4. A device according to claim 3 wherein rotation is transmitted from said drive element to said clutch by a 

1. A device for shearing non-circular metal sections into blanks by twisting comprising: a body; two interacting dies installed coaxially in said body and made in the form of bushings with holes for the passage of the metal sections, one of the bushings being capable of turning around its axis while the other one can slide axially in said body and is flexibly pressed against the face of said turnable die in the metal shearing plane; a rotating drive element installed in said body coaxially with said dies; a clutch installed coaxially between said rotating element and turnable die for coupling them.
 2. A device according to claim 1 wherein the faces of said clutch and turnable die directed to each other are provided with engaging cams.
 3. A device according to claim 1 wherein said drive element has a flywheel secured in said body on the same axle with said clutch and dies and rotated by a drive.
 4. A device according to claim 3 wherein rotation is transmitted from said drive element to said clutch by a turning key entering a slot made partly in said clutch and partly in said flywheel. 